%0 Journal Article %A WANG Jiang1 %A LI Ruqi1 %A HUANG Yan2 %A ZHAO Keming1 %A LI Jiangang1 %A ZHOU Yaman1 %T Cause of a Rare Rainstorm in the West of Southern Xinjiang in 2013 %D 2015 %R 10.11755/j.issn.1006-7639(2015)-06-0910 %J Journal of Arid Meteorology %P 910-917 %V 33 %N 6 %X

Based on the hourly precipitation data of automatic weather stations, NCEP reanalysis data with 1°×1° spatial resolution, the cause of a rare rainstorm in the west of southern Xinjiang from 26 to 29 May 2013 was diagnosed and analyzed by using frontogenesis function and moist potential vorticity (MPV). Results are as follows: (1) The rainstorm was caused by the Central Asia low vortex. The coupling of upper-level southwest jet and low-level easterly jet was beneficial to the formation of secondary circulations, which played an important role to ascending motion development and vapor convergence uplift. (2) The rainfall mainly occurred in the energy frontal zone, and the rainstorm center was located in the dense and steep area of the θse isolines. (3) The rainfall was corresponded well to the frontogenetical function, and the intensity and duration of precipitation had obvious relativity with the strength and extension height of frontogenesis. (4) The rainstorm  occurred in the dense area of isolines nearby the zero lines of MPV on 700 hPa. The configuration of MPV with positive in upper and negative in low and the sliding down of high MPV was advantageous to the convection development and rainfall strengthening.

%U http://www.ghqx.org.cn/EN/10.11755/j.issn.1006-7639(2015)-06-0910